Help with color based task

[david212]

Hello friends. I have one hometask to solve. Here it is:

 

<?
$vargame = 0;
$colorgame = "red";
$gametrick = 0;
while ($vargame <= 10) {
  if ($gametrick > 100) {
     echo "Abort!";
     break;
  }
  else if ($vargame < 4 && $gametrick < 2) {
     $vargame += 3;
     $colorgame = "green";
  }
  else if ($vargame == 8 AND $colorgame == "red") {
     $vargame--;
     $colorgame = "yellow";
  }
  else if ($colorgame == "yellow" XOR $vargame >= 7) {
     $vargame++;
     $colorgame = "blue";
  }
  else {
     $vargame += 2;
     $colorgame = "red";
  }
  $gametrick++;
} 
?>

and the question is Which color "wins" the game? So in this line:

 

  else if ($vargame < 4 && $gametrick < 2) {
     $vargame += 3;
     $colorgame = "green";
  }

 

the value of $vargame is 0 and it is less than 4. the $gametrick also is less than 2 and its value is 0; The line  $vargame += 3; means that the value of  $vargame will be 3.  In this line

 

else if ($vargame == 8 AND $colorgame == "red") {
     $vargame--;
     $colorgame = "yellow";
  }

 

the value of $vargame  is 3 and it wont be 8 and $colorgame  value is now green and it won't be red

 

else if ($colorgame == "yellow" XOR $vargame >= 7) {
     $vargame++;
     $colorgame = "blue";
  }

 

as i know XOR is used when one of the value is true not both of them and here $colorgame  is not yellow it is green and $vargame >= 7 is not more than 7 it is 3. So imy question is which color won the game? I think green color won the game. How can i calculate how many loops are in the code? Could any one help me to understand better the code?

 

Thank you

[cags]

Just follow it through in your head if it helps the write down what happens. This may not be perfect as I rushed through, but it should give you an idea.

 

start loop ($vargame = 0, $gametrick = 0, $colorgame = "red")

$vargame += 3 (becomes 3)

$colorgame = "green"

$gametrick++ (becomes 1)

start loop ($vargame = 3, $gametrick = 1, $colorgame = "green")

$vargame += 3 (becomes 6)

$colorgame = "green"

$gametrick++ (becomes 2)

start loop ($vargame = 6, $gametrick = 2, $colorgame = "green")

$vargame += 2 (becomes

$colorgame = "red"

$gametrick ++ (becomes 3)

start loop ($vargame = 8, $gametrick = 3, $colorgame = "red")

$vargame--(becomes 7)

$colorgame = "yellow"

$gametrick++ (becomes 4)

start loop ($vargame = 7, $gametrick = 4, $colorgame = "yellow")

$vargame += 2 (becomes 9);

$colorgame = "red";

$gametrick++ (becomes 5)

start loop ($vargame = 9, $gametrick = 6, $colorgame = "red")

$vargame += 2 (becomes 11)

$colorgame = "red";

$gametrick++(becomes 6)

end loop

[ignace]

I got this:

 

0: $vargame = 0, $colorgame = "red", $gametrick = 0;
1: $vargame = 3, $colorgame = "green", $gametrick = 1;//elseif ($vargame < 4 && $vargame < 2)
2: $vargame = 6, $colorgame = "green", $gametrick = 2;//elseif ($vargame < 4 .. 
3: $vargame = 8, $colorgame = "red", $gametrick = 3;//else
4: $vargame = 7, $colorgame = "yellow", $gametrick = 4;// elseif ($vargame == 8 ..
5: $vargame = 9, $colorgame = "red", $gametrick = 5;// else
6: $vargame = 10, $colorgame = "blue", $gametrick = 6;// elseif ($colorgame == "yellow" ...
7: end

 

The text in comments is what applied.

[cags]

Quite right, should have gone into the elseif($colorgame ... not sure why I went into the else, that's what you get for rushing, there's also some copy-paste/typos in mine.